Why do the properties of elements change in a regular way across a period

What does a decrease in temperature indicate about the molecules in a sample of liquid water? Decreased chemical energy of the molecules Decreased kinetic energy of the molecules Increased chemical energy of the molecules Increased kinetic energy of

What triggers nuclear fusion in stars?

Which of these statements is true? a. Chemical reactions can be slowed down by increasing the temperature. b. Once a chemical reaction gets started, the reacting particles no longer have to collide for products to form. c.

According to the theory of continental drift, what did the earth continents look like 255 million years ago

A galvanic^cell consists of left ompartmcnt with a tin elcctrode in contact with 0.1 M Sn (NO_3) _2 (aq) and a right compartment with a lead electrode in contact with 1 times l0^-3 M Pb (NO_3) _2 (aq).

Balance the following oxidation-reduction reaction: Fe (s) + Na + (aq) →Fe2 + (aq) + Na (s) Express the coefficients as integers separated by commas (e. g., 4,1,3,2, where 1 indicates the absence of a coefficient).

What are the three sub-types of convergent plate boundaries

Which phrase describes an atom

How many moles of NH3 are in 0.250 L of a 5.00 M aqueous solution?

There are different types of bonds based on electronegativity. One bond type is known as non-polar covalent. Which choice below has this bond type? A. all of the compounds B. H2 C. H2O D. NaCl